Original cover artwork for first Harry Potter book up for auction

The original cover artwork for the first Harry Potter book is up for auction. Artist Thomas Taylor was one of the first to read J.K. Rowling's original manuscript for Harry Potter and the Philosopher's Stone. He created the artwork using watercolour and black pencil in just two days. It is currently on display at Sothesby's New York and is expected to fetch between $600,000 and $900,000.